Observation of Effective Permittivity of Water-Dispersible FePt Nanoparticles at Microwave Frequencies

Author

Hung, D.S. ; Chiang, P.C. ; Lee, C.W. ; Ho, C.S. ; Chieng, S.H. ; Yao, Y.D.

Author_Institution

Dept. of Inf. & Telecommun. Eng., Ming Chuan Univ., Taipei

Volume

43

Issue

2

fYear

2007

Firstpage

879

Lastpage

881

Abstract

The 2-4 nm FePt nanoparticles were synthesized by chemical reduction and dispersed into the aqueous solution after the surface modification. The dielectric spectra were measured by an open-ended transmission line technique. An open-ended coaxial cable line was designed to transmit the microwave signals into nanoparticle-filled solutions. The reflection signal revealed the dielectric properties of hydrophobic-coated FePt-filled solution was received by the transmission line. The analysis showed that the effective permittivity was around 70 and down to 50 by the external magnetic field. The flexibility of nanoparticles´ permittivity revealed in this study implicates their potential applications ranged from in microwave and millimeter-wave components to biomedical drug delivery system and positron emission tomography scan

Keywords

biomedical materials; disperse systems; ferromagnetic materials; iron alloys; magnetic particles; microwave materials; nanoparticles; permittivity; platinum alloys; reduction (chemical); transmission line matrix methods; 2 to 4 nm; FePt; biomedical drug delivery system; biomedical materials; chemical reduction; dielectric properties; dielectric spectra; effective permittivity; external magnetic field; hydrophobic-coated FePt-filled solution; microwave component; microwave frequencies; millimeter-wave component; nanoparticle-filled solutions; open-ended coaxial cable line; open-ended transmission line technique; positron emission tomography scan; reflection signal; surface modification; water-dispersible nanoparticles; Biomedical measurements; Chemicals; Coaxial cables; Dielectric measurements; Microwave frequencies; Nanoparticles; Permittivity measurement; Signal design; Signal synthesis; Transmission line measurements; FePt; microwave; nanoparticles; permittivity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.888488

Filename

4069029